View of the Graf Zeppelin at an angle flying over Buckingham Fountain in Chicago's Grant Park. Crowds stand in the foreground, and the Chicago skyline is visible in the background. IMAGE: CHICAGO HISTORY MUSEUM/GETTY IMAGESView of the Graf Zeppelin at an angle flying over Buckingham Fountain in Chicago's Grant Park. Crowds stand in the foreground, and the Chicago skyline is visible in the background. IMAGE: CHICAGO HISTORY MUSEUM/GETTY IMAGES
View of the Graf Zeppelin at an angle flying over Buckingham Fountain in Chicago's Grant Park. Crowds stand in the foreground, and the Chicago skyline is visible in the background. IMAGE: CHICAGO HISTORY MUSEUM/GETTY IMAGES